I have problems making my LiteOn 811S (Pacific Digital) to play sound from DVDs. I am puzzled. I replaced the Samsung CD-ROM in my Dell Poweredge 600sc with the LiteOn 811S (Pacific Digital U-30201-RV1 Mach-8). I connected sound cable to the sound module (on board soundcard - Intel/SoundMAX) in the same way how the Samsung CD-ROM was connected yet I do not hear sound when playing DVDs. Aside from that everything works just fine.

for playing dolbi digital or other surrounds soundtypes...you need a codec to play those sounds.Actually you don't need a cable for sounds to play, because your drive can play it digital through the ide-cable.